关键词: 流体包裹体, 古地温演化, 单个有机包裹体成分, 生物标志化合物, 克依构造带

Abstract: Based on slice observation and petrology analysis,the homogenization temperature,laser Roman spectra,chromatogram and chromatogram-spectrograph of fluid inclusions were tested and analysed in Keyi structural zone where Kela-2 gas pool—the largest one in China at present is situated.Obtained were paleogeotemperature data, single organic inlusion components, together with the organic components and biomarker parameters of inclusion groups. Analysed were the evolution characteristics of paleogeotemperature,diagenesis stages of reservoir rocks,biomarker characteristics in inclusions,the stages of migration evolution and congregation degree. The inclusion study indicates that the oil-gas geological characteristics show the pattern of sectionation in East-West and nonlinear evolution in vertical direction.The characteristics of paleo-geotemperature evolution is paleo-geotemperature change in the trend of high→low→high from west to east.The homogenization of inclusion shows that oil-gas evolution possesses multi-period feature which underwent two or three times of migrition and filling of oil-gas.The diagenetic stage in Keyi structural zone is middle-diagenetic period in which the inclusions of Ⅰ、Ⅱ、Ⅲ come into being in early-middle, middle and later stage of middle-diagenetic period. The whole characteristics of biomarkers of inclusions reflect that mass inclusions contain the oil-gases of different periods.The inclusions-Ⅰrepresents condensate (oil) stage,the inclusions-Ⅱ represents condensate gas stage and inclusions-Ⅲ represents dry gas stage.

Key words: fluid inclusion, paloe-geotemperature evolution, single organic inclusion components, biomarker in inclusions, Keyi structural zone